How do i do a dc cupcake swirl ??? what tip do i use? http://www.google.com/imgres?imgurl=http://a3.twimg.com/profile_images/111892693/heart_normal.jpg&imgrefurl=http://listorious.com/cupcakeblog/cupcakebakeries&usg=__knw_dbIla4Zuleo37sdhXQDbbDw=&h=391&w=376&sz=60&hl=en&start=0&zoom=1&tbnid=VXEKURJkG1FXFM:&tbnh=149&tbnw=140&ei=ouchTqqDGI_HsQK87M2WAw&prev=/search%3Fq%3Ddc%2Bcupcakes%26um%3D1%26hl%3Den%26sa%3DN%26biw%3D1143%26bih%3D765%26tbm%3Disch&um=1&itbs=1&iact=hc&vpx=343&vpy=321&dur=332&hovh=229&hovw=220&tx=102&ty=158&page=1&ndsp=19&ved=1t:429,r:15,s:0&biw=1143&bih=765

They use a large round tip. I buy mine from the seller listed in the link below. I've searched a lot for this tip and my only luck was this seller (although I'm sure others would know where to get them).

http://www.etsy.com/listing/62673567/extra-large-round-pastry-tip-for-cupcake

Watch this video:

http://www.marthastewart.com/349227/hummingbird-cupcakes

Scroll down a little and the video is on the left side. It's towards the end where the sisters show Martha Stewart how to make their "signature swirl"

or get your couppler (sp?) and just tape over the slit.

Thanks for the help!!!v

Use an Ateco 808. 

I read in an article that Ateco 808 is the tip the bakery uses in all their stores.